Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
ALL FOR THE CAR
Every year our industry produces more and more cars. Today while driving to meet a man of almost any profession — the engineer, doctor, architect and worker, farmer and teacher. On how...
SEWING… JIGSAW
Fans to cut a variety of openwork decoration of wood has its own fixtures — ranging from simple plates of the dovetail with a clamp to vibrolance with electric. I propose for this...
